There is no public build yet.
Motel OS is pre-alpha. It boots and installs from a USB stick, and it is not yet something to put on a machine you rely on. Images are built from source and tested privately until that changes.
Everything needed is in the repository. On a machine with Docker and about 60 GB free:
git clone https://github.com/arothm/OS
cd OS
./build/build-packages.sh && ./build/build-repo.sh
./build/build.sh --edition core
The image lands in build/out/ with its checksum beside it.
Updates come from https://repo.motelos.systems, which
is configured on every install. Nothing needs adding by hand.